GENERAL DESCRIPTION
The ADE77681 is a high accuracy, electrical energy metering IC. It is a pin reduction version of the ADE7755, enhanced with a precise oscillator circuit that serves as a clock source to the chip. The ADE7768 eliminates the cost of an external crystal or resonator, thus reducing the overall cost of a meter built with this IC. The chip directly interfaces with the shunt resistor.

FEATURES
   On-chip oscillator as clock source
   High accuracy, supports 50 Hz/60 Hz IEC62053-21
   Less than 0.1% error over a dynamic range of 500 to 1
   Supplies positive-only average real power on frequency
      outputs F1 and F2
   High frequency output CF calibrates and supplies
      instantaneous, positive-only real power
   Logic output REVP indicates potential miswiring or negative
      power
   Direct drive for electromechanical counters and 2-phase
      stepper motors (F1 and F2)
   Proprietary ADCs and DSPs provide high accuracy over
      large variations in environmental conditions and time
   On-chip power supply monitoring
   On-chip creep protection (no-load threshold)
   On-chip reference 2.45 V (20 ppm/°C typical) with
      external overdrive capability
   Single 5 V supply, low power (20 mW typical)
   Low cost CMOS process